Question: 1. Why is direct memory access(DMA) considered an efficent mechamism for performing large I/O? 2. Suppose a program is executed 2.5 times faster in a

1. Why is direct memory access(DMA) considered an efficent mechamism for performing large I/O?

2. Suppose a program is executed 2.5 times faster in a quad-core machine than in a single-core mahcine. Calculate the percentange of the serial portion of the program.

3.Describe the basic idea of microkernel OS design approach and explain the advantages.

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